update.rb: some fixes and improvements, including the ability to use this script on non-master branches.  optional arg now specifies the branch to which you wish to switch.
update.rb: some fixes and improvements, including the ability to use this script on non-master branches.  optional arg now specifies the branch to which you wish to switch.

jamoma/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,jamoma/Jamoma,eriser/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore,jamoma/Jamoma,eriser/JamomaCore,eriser/JamomaCore,jamoma/JamomaCore,jamoma/JamomaCore,eriser/JamomaCore